Industrial Size Guttering

[GNRi1959]

I need guttering and downpipes for my Goods Store. It would be industrial sized material, the prototype was quite large, almost box section. Any clues?

[Glenderg]

Find an old broken umbrella, remove the links from the main pole to the arms, but and fit to suit. The smaller the umbrella, the smaller the profile. 

The alternative is folding catering foil to a profile, but this takes a lot of setup and messing. R